TWI528346B - Method for driving a light source apparatus with varying luminance and a display apparatus having the light source apparatus - Google Patents

Description

Method for driving a light source device by changing brightness and display device having the same

The present invention relates to a light source for a display device and a method for driving the light source.

In general, liquid crystal display (LCD) devices are thin, light, and have low power consumption, which makes them popular in large television screens, monitors, notebook computers, cellular phones, and the like. The LCD device includes an image display panel that uses a photoelectrically controlled light transmissive liquid crystal and a backlight assembly that supplies light to the display panel.

The backlight assembly includes a light source that produces light to display an image on a display panel. The backlight assembly can be applied to a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED). Today, backlight assemblies primarily use LEDs rather than CCFLs because of their low power consumption and high color reproducibility.

The display LEDs include a red LED, a green LED, and a blue LED. The red, green and blue light generated from the red LED, the green LED and the blue LED are mixed into white light. However, the brightness of the LED varies depending on its time of use, temperature, and humidity.

Figure 1 is a graph illustrating the relationship between lifetime and brightness of an LED.

Referring to Figure 1, the LEDs have different brightness characteristics and lifetime depending on the color of the LED. The lifetime of the red LED is the shortest of the three color LEDs.

The backlight assembly compensates for changes in LED brightness to achieve accurate color reproducibility. In the prior art, the backlight assembly uses a color sensor to detect the amount of light produced by the red, green, and blue LEDs. Next, the backlight assembly adjusts the brightness by comparing the amount of detected light to the target color coordinates and the target brightness, and then optimizes the driving signals to the red, green, and blue LEDs.

However, as the LED usage time increases, its brightness decreases and the backlight assembly may not be able to match the target white coordinates and target brightness.

According to an aspect of the present invention, there is provided a method of driving a light source capable of maintaining a target white coordinate despite a decrease in brightness.

In another aspect, the present invention provides a light source apparatus suitable for applying the method of driving the light source.

Further, the present invention provides a display device having the light source device.

According to another aspect of the present invention, a method for driving a light source includes: presetting a duty ratio for a plurality of color light sources, wherein each color light source has a predetermined reference material of brightness; detecting by a plurality of sensors Measure a quantity of color light generated by a plurality of color light sources and store the sensing data; compare the sensing data with the reference material of a color light source; based on the detected color light from the color light source The reference material is modified and the colored light is adjusted based on the modified reference data by controlling a drive signal provided to the color light sources.

The method can further include comparing the sensed data to the reference data and verifying whether the color light source has a preset duty cycle when the sensed data is not equal to the reference data.

Modifying the reference material may include detecting an amount of color light from the color light source driven by the preset duty ratio, calculating a ratio between the color data of the sensing material and the reference material, and generating a modified ratio based on the ratio The information is modified and the reference material is modified based on the modified information.

The preset duty cycle can be the maximum duty cycle.

In an example embodiment, the color light sources comprise a red light emitting diode (LED), a green LED, and a blue LED.

The reference may include forming a target luminance and a target white coordinate red light reference amount, a green light reference amount, and a blue light reference amount.

The method can further include adjusting the amount of colored light based on the reference material when the color source is not driven by a preset duty cycle color light.

Adjusting the amount of colored light can include converting the amount of colored light into a digital type of sensing material and controlling the driving signal provided to the color light sources by comparing the sensing data to the reference material.

According to another aspect of the present invention, a light source device is provided. The light source device comprises: a light source module having a plurality of color light sources; a light source driving portion driving the color light sources with a preset duty ratio; and a light sensing portion detecting the color light sources a quantity of colored light generated; and a light source control portion that compares the sensed data color light with the reference material, modifies the reference material based on the detected amount of the colored light, and adjusts the colored light the amount.

The light source control portion may verify whether the color light source is driven by the preset duty color light when the sensing data is not equal to the reference material.

The color light sources can include a red LED, a green LED, and a blue LED.

The light source device can further include a storage portion for storing the reference material. The reference material can include forming a target luminance and a red light reference amount of a target white coordinate, a green light reference amount, and a blue light reference amount.

In an example embodiment, the light sensing portion includes: a red light sensor that detects red light generated from the red LED; and a green light sensor that detects green generated from the green LED Light; a blue light sensor that detects blue light generated from the blue LED; a red light amplifier that amplifies red light output from the red light sensor; and a green light amplifier that amplifies from the green light The green light output from the sensor; and a blue light amplifier that amplifies the blue light output from the blue light sensor.

In an example embodiment, the light source control portion includes: an analog to digital converter (ADC) that measures the amount of red light input from the red optical amplifier and the amount of green light input from the green optical amplifier And converting a quantity of blue light input from the blue light amplifier into a digital type of sensing data; and a control part controlling a color light source by comparing the sensing data with the reference material Driving the signal and adjusting the amount of the colored light.

The control portion may calculate a ratio between the sensing data of the color light source and the reference material when checking the color light source driven by the preset duty ratio, generate modified data based on the ratio, and based on the The reference material is modified by the revised information.

According to another aspect of the present invention, a display device is provided. The display device includes: a display panel displaying an image; a light source module having a plurality of color light sources and providing color light to the display panel; and a light source driving portion driving the preset duty ratio a color light source; a light sensing portion that detects an amount of color light generated by the color light sources driven by the light source driving portion; and a light source control portion that maintains a color light source brightness by: Color light: comparing the sensing data corresponding to the amount of the colored light with the reference material, modifying the reference material based on the amount of colored light driven by the preset duty ratio, and adjusting the amount of colored light .

The display device can further include a user input portion that receives information about the target color coordinates and the target brightness from a user. The light source control section may modify the reference material based on information input from the user input section.

According to the present invention, even if the brightness of one of the color light sources changes, the target white coordinates can be maintained.

The above and other features and advantages of the present invention will become more apparent from the embodiments of the invention.

The invention is described more fully hereinafter with reference to the accompanying drawings in which, However, the invention may be embodied in many different forms and should not be construed as limited to the example embodiments set forth herein. Rather, the example embodiments are provided so that this invention will be thorough and complete, and the scope of the invention will be fully conveyed by those skilled in the art. In the figures, the size and relative sizes of layers and regions may be exaggerated for clarity.

It will be understood that when an element or layer is referred to as "on", "connected" or "coupled" to another element or layer, Directly coupled or coupled to another element or layer, or an intervening element or layer. In contrast, when an element is referred to as “directly,” “directly connected” or “directly connected” or “directly connected” to another element or layer, there is no intervening element or layer. Like numbers in the text refer to like elements. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, such elements, components, regions, layers and/or sections It should not be limited by these terms. The terms are only used to distinguish one element, component, region, layer or layer from another. Thus, a first element, component, region, layer or layer hereinafter referred to as a second element, component, region, layer or section may be referred to.

For the convenience of description, spatially related terms such as "under", "below", "lower", "above", "upper" and the like may be used. The relationship of one element or feature to another element or feature is illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device during use or operation, in addition to the orientation depicted in the Figures. For example, elements that are described as "below" or "beneath" or "an" or "an" Thus, the exemplary term "below" can encompass both an orientation of the above and below. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially related descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular example embodiments and is not intended to limit the invention. As used herein, the singular forms "" It will be further understood that the term "comprising", when used in the specification, is intended to mean the existence of the recited features, the whole, the steps, the operation, the components and/or components, but does not exclude the presence or addition of one or more other features, Steps, operations, components, components, and/or groups thereof.

Example embodiments of the present invention are described herein with reference to the cross-section illustrations, which are illustrative of the preferred embodiments (and intermediate structures) of the invention. Thus, variations from the shapes of the descriptions as a result, for example, of manufacturing techniques and/or tolerances are contemplated. Thus, example embodiments of the invention should not be construed as being limited to the specific shapes of For example, an implanted region illustrated as a rectangle will typically have a circular or curved feature and/or a gradient of implant concentration at its edges rather than a binary change from the implanted region to the non-implanted region. Likewise, the buried region formed by implantation can cause some implantation in the region between the buried region and the surface through which implantation takes place. The area illustrated in the figures is, therefore, in the nature of the invention, and is not intended to limit the scope of the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning meaning meaning It should be further understood that terms such as those defined in the commonly used dictionary should be interpreted as having a meaning consistent with their meaning in the context of the related art and will not be interpreted in an ideal or overly formal sense unless explicitly stated herein. So defined.

Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a display device in accordance with an embodiment of the present invention.

Referring to FIG. 2, a display device according to an embodiment of the present invention includes a display panel 100, a panel driving portion 130, a timing control portion 200, a user input portion 250, and a light source device 300.

The display panel 100 includes a plurality of pixels that display an image. For example, the number of pixels can be M x N (M and N are natural numbers). Each of the pixels P includes a switching element TR connected to the gate line GL and the data line DL, a liquid crystal capacitor CLC connected to the switching element TR, and a storage capacitor CST.

The timing control portion 200 receives the control signal CON and the video signal DATA. The control signal CON may include a vertical sync signal, a horizontal sync signal, and a pulse signal. The timing control portion 200 generates panel control signals 212 and 214 using the control signal CON to control the panel driving portion 130. The timing control portion 200 generates the light source control signal 220 using the control signal CON to control the light source device 300.

The panel driving portion 130 drives the display panel 100 using the panel control signal 212 from the timing control portion 200.

The panel driving portion 130 may include a data driving portion 132 and a gate driving portion 134. The panel control signal 212 includes a first control signal 212a that controls the driving timing of the data driving portion 132 and a second control signal 212b that controls the driving timing of the gate driving portion 134. The first control signal 212a can include a clock signal and a horizontal start signal. The second control signal 212b can include a vertical start signal.

The data driving portion 132 generates a material signal using the first control signal 212a and the image signal DATA. The data driving section 132 mentions the data signal Available to data line DL.

The gate driving portion 134 generates a gate signal using the second signal 212b. This gate signal turns on the gate line GL. The gate driving portion 134 supplies the gate signal to the gate line GL.

User input portion 250 includes a user interface for inputting user input signals. From the user, the user input portion 250 receives the color characteristic information of the light to adjust the color and brightness characteristics of the light output from the light source device 300. The user input portion 250 supplies the color characteristic information of the light to the light source device 300. For example, the user input portion 250 can be disposed outside the outer casing of the display panel 100.

The light source device 300 supplies light to the display panel 100 in response to the light source control signal 220 received from the timing control portion 200.

The light source device 300 includes a light source module 310, a light sensing portion 330, a storage portion 350, a light source control portion 370, and a light source driving portion 390.

The light source module 310 includes a plurality of color light sources and a driving substrate for arranging the color light sources. The color light source includes a red light emitting diode (LED) that generates red light, a green LED that produces green light, and a blue LED that generates blue light. The light source module 310 includes M×N (M and N are natural numbers) light-emitting blocks B. Each of the light-emitting blocks B may include a plurality of LEDs.

The light sensing portion 330 detects the amount of red light, the amount of green light, and the amount of blue light generated from the red LED, the green LED, and the blue LED. The light sensing portion 330 supplies the detected amount of red light, green light, and blue light to the light source control portion 370.

The storage portion 350 stores a plurality of reference materials required to adjust the amount of red light, the amount of green light, and the amount of blue light of the red LED, the green LED, and the blue LED. The reference material may include the amount of red light corresponding to the target brightness and the target white coordinate, the amount of green light, and the amount of blue light. References can be obtained by testing during the production process. The reference material can be modified to correspond to color characteristic information input from the user input portion 250. When the amount of colored light is small in the color light source, the reference material can be modified based on the amount of colored light.

Although not shown in the drawings, the storage portion 350 may be disposed in the light source control portion 370.

The light source control portion 370 analyzes the image signal DATA input from the outside of the display device. The light source control portion 370 outputs a dimming signal to control the light-emitting block B. The light source control portion 370 adjusts the amount of colored light by comparing the color light intensity data detected by the color light of the light sensing portion 330 with the reference material stored in the storage portion 350. The light source control portion 370 can adjust the amount of colored light by controlling a driving signal received from the color light source. For example, the light source control portion 370 can adjust the amount of colored light by modulating the pulse width of the current signal received from the color light source such that the target white coordinate and the target brightness are maintained. The light source control portion 370 can adjust the amount of colored light by modulating the current signal level received from the color light source.

The light source control portion 370 checks whether the color light source is driven by the preset duty ratio when the sensing data is not equal to the reference material. The preset duty cycle can be the maximum duty cycle (100%). If there is a color light source driven by a preset duty ratio, the light source control portion 370 modifies the reference material based on the amount of colored light from the color light source driven by the preset duty ratio. The light source control portion 370 controls the light sensing portion 330 to detect the amount of colored light from the color light source driven by the preset duty ratio. The light source control portion 370 calculates a ratio between the detected light data from the color light source driven by the preset duty ratio and the reference material. Based on the ratio, the light source control section 370 generates modified data to modify the reference material. For example, the light source control portion 370 can generate the modified material by multiplying the reference material by the ratio. The light source control section 370 supplies the modified material to the storage section 350 to modify the reference material of the storage section 350. The light source control portion 370 adjusts the amount of colored light of the color light source based on the modified reference material.

The light source control portion 370 can modify the reference material based on the color characteristic information input from the user input portion 250 when the color characteristic information is input by the user from the user input portion 250.

The light source driving portion 390 drives the light-emitting block based on the red, green, and blue driving signals received by the light source control portion 370.

Fig. 3 is a detailed block diagram showing the light source device of Fig. 2.

2 and 3, the light source device 300 includes a light source module 310, a light sensing portion 330, a storage portion 350, a light source control portion 370, and a light source driving portion 390.

The light source module 310 includes a red LED (R_LED), a green LED (G_LED), and a blue LED (B_LED).

The light sensing portion 330 includes a photo sensor 332 and an amplifier 334.

The light sensor 332 includes: a red light sensor 332a that detects the amount of red light generated by the red LED R_LED; and a green light sensor 332b that detects the amount of green light generated by the green LED G_LED; A blue light sensor 332c detects the amount of blue light generated by the blue LED B_LED. The light sensor 332 can be disposed on the center of the light source module 310. The light sensor 332 can be disposed on a side of the light source module 310.

The amplifier 334 includes a red light amplifier 334a that amplifies the red light output from the red light sensor 332a, a green light amplifier 334b that amplifies the green light output from the green light sensor 332b, and a blue light amplifier 334c that is amplified from The blue light output by the blue light sensor 332c. Each of the red, green, and blue light amplifiers 334a, 334b, and 334c may include an operational amplifier (op-amp) as a low pass filter (LPF).

The light source control portion 370 includes an analog to digital converter (ADC) 372 and a control portion 374.

The ADC 372 converts the red, green, and blue sensing signals into digital, red, green, and blue sensing data.

The control portion 374 compares the sensed data with the reference material stored by the storage portion 350. The control portion 374 checks whether the color light source is driven by the preset duty ratio when the sensing data is not equal to the reference material. The light source control portion 370 modifies the reference material based on the amount of color light of the color light source driven by the preset duty ratio when the color light source is driven by the preset duty ratio. The control portion 374 controls the light sensing portion 330 to detect the amount of colored light from the color light source driven by the preset duty ratio. The control portion 374 calculates a ratio between the sensed material of the color light source driven by the preset duty ratio and the reference material. The control portion 374 generates the modified reference material by multiplying the reference material by the ratio. The light source control section 370 supplies the modified material to the storage section 350 to modify the reference material of the storage section 350. The light source control section 370 adjusts the amount of colored light from the color light source based on the modified reference material.

The light source driving portion 390 includes a red driving portion 392 that supplies a red driving signal to the red LED R_LED, a green driving portion 394 that supplies a green driving signal to the green LED G_LED, and a blue driving portion 396 that emits a blue signal Available to the blue LED B_LED.

4 is a timing diagram illustrating a method for driving a light source device.

Referring to FIGS. 3 and 4, the light sensing portion 330 detects the amount of red light, the amount of green light, and the amount of blue light generated from the red LED R_LED, the green LED G_LED, and the blue LED B_LED (step S110). The light sensing portion 330 amplifies the red, green, and blue sensing signals. The light sensing portion 330 outputs the amplified red, green, and blue sensing signals to the ADC 372. The ADC 372 converts the red, green, and blue sensing signals into digital data. The ADC 372 outputs digital data.

The control section 374 checks whether the red, green, and blue sensing materials are equal to the reference material stored by the storage section 350 (step S120).

When the red, green, and blue sensing data are equal to the reference material in step S120, the control portion 374 maintains the preset duty ratios of the driving signals supplied to the red LED R_LED, the green LED G_LED, and the blue LED B_LED (step S130).

When the red, green, and blue sensing materials are not equal to the reference material in step S120, the control portion 374 checks whether there is an LED driven by the preset duty ratio among the red LED R_LED, the green LED G_LED, and the blue LED B_LED (step S140). ).

If there is no LED driven by the preset duty ratio in step S140, the control portion 374 resets the duty ratios of the driving signals of the red diode R_LED, the green diode G_LED, and the blue diode B_LED. The amount of red light, green light, and blue light is adjusted such that the red sensing data, the green sensing data, and the blue sensing data are equal to the reference material (step S150). The process returns to step S110. Steps S110 to S140 are repeatedly executed.

If there is an LED driven by the preset duty ratio in step S140, the control portion 374 controls the light sensing portion 330 to detect the amount of colored light from the LED driven by the preset duty ratio. The light sensing portion 330 detects the amount of color light from the LED driven by the preset duty ratio in accordance with the control of the control portion 374 (step S160).

The control portion 374 calculates a ratio between the sensed data of the LED driven by the preset duty ratio and the reference material of the LED driven by the preset duty ratio (step S170).

Based on the ratio, the control section 374 generates the modified material to modify the reference material (step S180). For example, control portion 374 can generate modified material by multiplying the reference material by the ratio.

The control section 374 changes the reference material to the modified material (step S190). The process returns to step S120. Step S120 is performed again.

In accordance with the present invention, when one of the red LED R_LED, the green LED G_LED, and the blue LED B_LED has a reduced brightness, the reference material is modified based on the amount of detected colored light from the LED having the reduced brightness. By adjusting the amount of red light, the amount of green light, and the amount of blue light with respect to the modified reference material, the target white coordinate can be maintained at all times. Therefore, the image quality of the display device can be improved.

Although the exemplified embodiments of the present invention have been described, it should be understood that the present invention should not be construed as limited to the exemplified embodiments. Make various changes and modifications.

100. . . Display panel

130. . . Panel drive section

132. . . Data driven part

134. . . Gate drive section

200. . . Timing control section

212. . . Panel control signal

214. . . Light source control signal

250. . . User input section

300. . . Light source device

310. . . Light source module

330. . . Light sensing part

332. . . Light sensor

332a. . . Red light sensor

332b. . . Green light sensor

332c. . . Blue light sensor

334. . . Amplifier

334a. . . Red optical amplifier

334b. . . Green optical amplifier

334c. . . Blue light amplifier

350. . . Storage section

370. . . Light source control section

372. . . Analog to digital converter (ADC)

374. . . Control section

390. . . Light source driving part

392. . . Red drive section

394. . . Green drive section

396. . . Blue drive section

B. . . Illuminated block

CLC. . . Liquid crystal capacitor

CST. . . Storage capacitor

DL. . . Data line

GL. . . Gate line

P. . . Pixel

TR. . . Switching element

1 is a view for explaining the relationship between the life and brightness of a light-emitting diode (LED);

2 is a block diagram illustrating a display device in accordance with an example embodiment of the present invention;

Figure 3 is a detailed block diagram showing the light source device of Figure 2;

4 is a flow chart showing a method for driving the light source device of FIG.

200. . . Timing control section

330. . . Light sensing part

332. . . Light sensor

332a. . . Red light sensor

332b. . . Green light sensor

332c. . . Blue light sensor

334. . . Amplifier

334a. . . Red optical amplifier

334b. . . Green optical amplifier

334c. . . Blue light amplifier

350. . . Storage section

370. . . Light source control section

372. . . Analog to digital converter (ADC)

374. . . Control section

390. . . Light source driving part

392. . . Red drive section

394. . . Green drive section

396. . . Blue drive section

Claims (23)

A method for driving a light source, the method comprising: presetting a duty ratio for a plurality of color light sources, wherein each color light source has a predetermined reference data of brightness; detecting a plurality of color light sources by using a plurality of sensors Generating a sensing data by one of the brightness of the generated colored light and based on the detected brightness of the colored light; comparing the sensing data with the predetermined reference material of a color light source; based on the detected Detecting the amount of brightness of the colored light from the color source using the ratio between the sensed data and the reference material to modify the predetermined reference material to determine a modified reference material; and based on the modified reference material The amount of brightness of the colored light from the colored light sources is adjusted by controlling a drive signal supplied to the color light sources. The method of claim 1, further comprising verifying whether the color light source has a preset duty cycle when the sensing data is not equal to the reference material. The method of claim 2, wherein modifying the predetermined reference material comprises: detecting the amount of brightness of the colored light from the color light source driven by the preset duty ratio; calculating the sensing data and the predetermined reference material The ratio is generated; the modified data is generated based on the ratio; and the predetermined reference material is modified based on the modified data. The method of claim 1, wherein the preset duty cycle is a maximum duty cycle. The method of claim 3, wherein the color light sources comprise a red light emitting diode (LED), a green LED, and a blue LED. The method of claim 5, wherein the predetermined reference material comprises a reference amount of luminance corresponding to a target luminance and a target white coordinate, a reference amount of luminance of the green light, and a reference amount of luminance of the blue light. The method of claim 1, further comprising adjusting the amount of brightness of the colored light based on the reference material when the color light source is not driven by the preset duty cycle. The method of claim 7, wherein the adjusting the brightness of the colored light comprises: converting the amount of brightness of the colored light into a digital type of the sensing data; and by using the sensing data with the predetermined The reference data is compared to control the drive signal provided to the color light source. A light source device includes: a light source module having a plurality of color light sources, wherein each color light source has a predetermined reference material of brightness; and a light source driving portion configured to drive the preset duty ratio a color light source; a light sensing portion configured to detect a brightness of the color light generated by the color light sources and to store a sense based on the amount of brightness of the detected color light And a light source control portion configured to compare the sensed data to the predetermined reference material based on the detected brightness of the colored light The predetermined reference data is modified using a ratio between the sensed data and the reference data to determine a modified reference material and the amount of brightness of the colored light is adjusted based on the modified reference material. The light source device of claim 9, wherein the light source control portion is configured to verify whether the color light source is driven by the preset duty cycle when the sensed data is not equal to the predetermined reference material. The light source device of claim 10, wherein the preset duty cycle is a maximum duty cycle. The light source device of claim 10, wherein the color light sources comprise a red LED, a green LED, and a blue LED. The light source device of claim 12, further comprising: a storage portion configured to store the predetermined reference material, wherein the predetermined reference material includes a reference amount of brightness of a red light that forms a target white light brightness and a target white coordinate, One of the reference quantity of the brightness of the green light and the reference quantity of the brightness of the blue light. The light source device of claim 12, wherein the light sensing portion comprises: a red light sensor configured to detect red light generated from the red LED; a green light sensor configured Detecting green light generated from the green LED; and a blue light sensor configured to detect blue light generated from the blue LED; and a red optical amplifier configured to amplify the red light a red light output by the light sensor; a green light amplifier configured to amplify the green light output from the green light sensor; and a blue light amplifier configured to amplify the blue light sensing The blue light is output from the device. The light source device of claim 14, wherein the light source control portion comprises: an analog to digital converter (ADC) configured to measure a brightness of the red light input from the red optical amplifier from the green Converting one of the brightness of the green light input by the optical amplifier and the brightness of the blue light input from the blue light amplifier into one of the digital type sensing materials; and a control portion configured to The sensed data is compared to the predetermined reference data to control a drive signal provided to the color light sources and to adjust the amount of brightness of the colored light. The light source device of claim 14, wherein the control portion is configured to calculate the ratio between the sensed material of the color light source and the predetermined reference material when examining the color light source driven by the preset duty cycle And modifying the predetermined reference data based on the modified profile and based on the revised data. A display device comprising: a display panel configured to display an image; a light source module having a plurality of color light sources and configured to provide colored light to the display panel; a light source driving portion It is configured to drive the color light sources with a preset duty cycle; a light sensing portion configured to detect one of the brightness of the colored light generated by the color light sources driven by the light source driving portion And a light source control portion configured to maintain a color light source brightness by comparing a sensed data corresponding to the amount of brightness of the colored light with a predetermined reference material, based on The preset duty cycle drive The amount of brightness of the moving colored light modifies the reference data using a ratio between the sensing data and the reference material to determine a modified reference material, and adjusts the brightness of the colored light based on the modified reference material The amount. The display device of claim 17, wherein the light source control portion is configured to verify whether the color light source is driven by the preset duty cycle when the sensed material is not equal to the reference material. The display device of claim 17, wherein the color light sources comprise a red LED, a green LED, and a blue LED, and wherein the reference material includes a reference amount of luminance of red light that forms a target brightness and a target white coordinate. One of the reference quantity of the brightness of the green light and one of the brightness of the blue light. The display device of claim 19, further comprising a user input portion configured to receive information about the target color coordinates and the target brightness from a user, and wherein the light source control portion The configuration is configured to modify the reference based on the information entered from the user input portion. The display device of claim 18, wherein the light source control portion comprises: an ADC configured to convert the amount of brightness of the colored light detected by the light sensing portion into a digital type of the sensing material And a control portion configured to control a drive signal provided to the color light sources and adjust the amount of brightness of the colored light by comparing the sensed data to the reference material. The display device of claim 21, wherein the control portion is configured to calculate The ratio between the sensed data and the reference material, the modified data is generated based on the ratio, and the reference material is modified based on the modified data. The display device of claim 22, wherein the preset duty cycle is a maximum duty cycle.